import 'dart:io';

import 'package:flutter/material.dart';
import 'package:gal/gal.dart';
import 'package:google_fonts/google_fonts.dart';
import 'package:http/http.dart' as http;

/// 与 [GenerateResultScreen] 保存相册逻辑一致，供 History 卡片 Download 使用。
Future<void> saveHistoryMediaToGallery({
  required BuildContext context,
  required String taskId,
  required String resultUrl,
}) async {
  final u = resultUrl.trim();
  if (!u.startsWith('http://') && !u.startsWith('https://')) {
    if (context.mounted) {
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
          content: Text(
            'Invalid media URL',
            style: GoogleFonts.inter(fontWeight: FontWeight.w600),
          ),
        ),
      );
    }
    return;
  }

  try {
    final ok = await Gal.hasAccess();
    if (!ok) {
      await Gal.requestAccess();
    }
    final uri = Uri.parse(u);
    final res = await http.get(uri);
    if (res.statusCode < 200 || res.statusCode >= 300) {
      throw HttpException('HTTP ${res.statusCode}');
    }
    final isVideo = historyUrlLooksLikeVideo(u);
    final ext = isVideo ? historyGuessVideoExt(u) : '.jpg';
    final file = File(
      '${Directory.systemTemp.path}/funymee_hist_${taskId}_$ext',
    );
    await file.writeAsBytes(res.bodyBytes);
    if (isVideo) {
      await Gal.putVideo(file.path);
    } else {
      await Gal.putImage(file.path);
    }
    if (!context.mounted) return;
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(
        content: Text(
          'Saved to Photos',
          style: GoogleFonts.inter(fontWeight: FontWeight.w600),
        ),
      ),
    );
  } on GalException catch (e) {
    if (!context.mounted) return;
    ScaffoldMessenger.of(
      context,
    ).showSnackBar(SnackBar(content: Text(e.type.message)));
  } catch (e) {
    if (!context.mounted) return;
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(content: Text('Save failed: $e')),
    );
  }
}

bool historyUrlLooksLikeVideo(String url) {
  if (url.isEmpty) return false;
  final lower = url.toLowerCase();
  const hints = ['.mp4', '.m3u8', '.webm', '.mov', '.mkv', '.avi'];
  return hints.any((h) => lower.contains(h));
}

String historyGuessVideoExt(String url) {
  final lower = url.toLowerCase();
  if (lower.contains('.webm')) return '.webm';
  if (lower.contains('.mov')) return '.mov';
  if (lower.contains('.m3u8')) return '.mp4';
  return '.mp4';
}